Over the last two to three months I have fielded the following question at least 30 times: "When is the time to spray for bagworms?" Because my standard answer is Memorial Day, and Memorial Day was ...
Q. I have 20 arborvitae trees in my backyard. This fall I’ve noticed I have a lot of bagworm nests. So far I have removed at least 60 of these nests. Prior years’ infestations have been very limited.